Packages with the gflags use flag

dev-cpp / glog : Google's C++ logging library

  • Use dev-cpp/gflags for flag parsing

media-libs / opencv : A collection of algorithms and sample code for various computer vision problems

  • Use Google's C++ argument parsing library

sci-libs / ceres-solver : Nonlinear least-squares minimizer

  • Use dev-cpp/gflags for flag parsing